Задача Задача №3483718
А
А
30
Tip: it’s just doubling 15 (15 + 15 = 2 × 15 = 30). Want a few quick mental-math tricks for similar problems?
30
Tip: it’s just doubling 15 (15 + 15 = 2 × 15 = 30). Want a few quick mental-math tricks for similar problems?